linux spi设备驱动

#include <linux/module.h>
#include <linux/spi/spi.h>

#define SPI_DEVICE_NAME "my_spi_device"
#define SPI_MODE 0
#define SPI_BITS_PER_WORD 8
#define SPI_SPEED 500000

static struct spi_device *spi_dev;

static int __init my_spi_init(void)
{
    struct spi_master *master;
    struct spi_board_info spi_device_info = {
        .modalias = "my_spi_device",
        .mode = SPI_MODE,
        .max_speed_hz = SPI_SPEED,
        .bits_per_word = SPI_BITS_PER_WORD,
    };

    master = spi_busnum_to_master(0); // 假设SPI总线编号为0
    if (!master) {
        pr_err("Failed to get SPI master\n");
        return -ENODEV;
    }

    spi_dev = spi_new_device(master, &spi_device_info);
    if (!spi_dev) {
        pr_err("Failed to create SPI device\n");
        return -ENODEV;
    }

    pr_info("SPI device initialized successfully\n");
    return 0;
}

static void __exit my_spi_exit(void)
{
    if (spi_dev) {
        spi_unregister_device(spi_dev);
        pr_info("SPI device unregistered\n");
    }
}

module_init(my_spi_init);
module_exit(my_spi_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple SPI device driver");